User:Mike Dillon/Scripts/easydom.js

Code that you insert on this page could contain malicious content capable of compromising your account. If you import a script from another page with "importScript", "mw.loader.load", "iusc", or "lusc", take note that this causes you to dynamically load a remote script, which could be changed by others. Editors are responsible for all edits and actions they perform, including by scripts. User scripts are not centrally supported and may malfunction or become inoperable due to software changes. A guide to help you find broken scripts is available. If you are unsure whether code you are adding to this page is safe, you can ask at the appropriate village pump.
This code will be executed when previewing this page.

Documentation for this user script can be added at User:Mike Dillon/Scripts/easydom.

Note: After saving, you have to bypass your browser's cache to see the changes. Google Chrome, Firefox, Microsoft Edge and Safari: Hold down the ⇧ Shift key and click the Reload toolbar button. For details and instructions about other browsers, see Wikipedia:Bypass your cache.

// <pre><nowiki>

function createEasyDomFunction(name) {
    var stringType = typeof '';
    var functionType = typeof function() {};

    // Detects if the first element is a hash of attributes and if so,
    // uses it to set attributes on the DOM node
    //
    // Returns the number of elements processed to let the caller know
    // how many of the arguments to skip
    var processAttributes = function(elem, args) {
        if (args.length == 0) {
            return 0;
        }

        // Detect string arguments
        var firstArgType = typeof args[0];
        if (firstArgType == stringType) {
            return 0;
        }

        // Detect function arguments
        if (firstArgType == functionType) {
            return 0;
        }

        // Detect DOM nodes
        if (typeof args[0].nodeType != 'undefined') {
            return 0;
        }

        // Assume that we got a hash of attributes as the first arg...
        var attrs = args[0];
        for (var attrName in attrs) {
            var attrValue = attrs[attrName];
            // Invoke functions and use their result as the value
            if (typeof attrValue == functionType) {
                attrValue = attrValue();
            }
            // Skip null values
            if (attrValue == null) {
                continue;
            }
            // Set the attribute
            elem.setAttribute(attrName, attrValue);
        }

        // Return the number of arguments processed
        return 1;
    };

    // Return the function that creates new DOM elements
    return function() {
        var elem = document.createElement(name);

        // Process attribute hash, if any and skip the argument count returned
        var firstChild = processAttributes(elem, arguments);

        // Process the remaining children, if any
        for (var i = firstChild; i < arguments.length; i++) {
            var child = arguments[i];
            if (typeof child == stringType) {
                child = document.createTextNode(child);
            }
            elem.appendChild(child);
        }

        return elem;
    };
}

var easyDomTags = [
    "script",
    "p",
    "a",
    "div", "span",
    "ul", "ol", "li",
    "img",
    "hr",
    "br",
    "em", "strong",
    "table", "tbody", "tr", "th", "td",
    "input",
    "h1", "h2", "h3", "h4", "h5"
];

var easyDom = {};
for (var i in easyDomTags) {
    easyDom[easyDomTags[i]] = createEasyDomFunction(easyDomTags[i]);
}

// Namespace pollution
var easydom = easyDom;
var easyDOM = easyDom;

// </nowiki></pre>